Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1975-10-16
1977-03-08
Heyman, John S.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
324 83D, 307232, 307251, H03D 1300, G01R 2500
Patent
active
040115038
ABSTRACT:
A known reference signal is applied to a zero crossing detector and normal and inverted outputs from the zero crossing detector are applied to the input control terminals of a pair of bilateral switches. A measured signal of the same frequency but not necessarily of the same phase is simultaneously applied to the input terminals of the bilateral switches. The resultant output of the bilateral switches is connected to a parallel RC network. The capacitor acquires a charge proportional to the deviation from 90.degree., which is applied to a differential amplifier. The output of the differential amplifier is used to drive a meter which indicates the phase relationship of the two signals. The capacitor used to accumulate the net charge is ungrounded to eliminate errors resulting from unequal currents to ground.
REFERENCES:
patent: 3281846 (1966-10-01), King
patent: 3386041 (1968-05-01), Bell
patent: 3456128 (1969-07-01), Myers
patent: 3524075 (1970-08-01), Matthews et al.
patent: 3591854 (1971-07-01), Cole
patent: 3668543 (1972-06-01), Bailey
patent: 3940693 (1976-02-01), Brown
Heyman John S.
Narco Scientific Industries, Inc.
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